Random lasers may show multiple sub-nanometer spectral peaks
above a pump threshold [1]}, as well as smoother, though always disordered, emission spectra. Depending on the material, and its optical and scattering properties, random spectral fluctuations between different pumping shots (i. e., different realizations of the same random laser) may or may not vary significantly.
A wide variety of spectral features is reported [2]}, [3]}, [4]}, [5]}, [6]}, depending on material compounds and experimental setups. Random lasers can be built in very different ways, can be both solid or liquid, can be 2D or 3D, the optically active material can be confined or spread all over the volume. Moreover, random lasers are, usually, open systems where light can propagate in any direction rather than oscillating between well specific boundaries (mirrors) as in standard lasers and the emission acquisition can only be directional rather than on the whole solid angle.
Finally, also the scattering strength and the pumping conditions may affect the emission.  
